Vat dyes and process of making same.



-vat dyestuffs of Gnono mmscnnn,

NISSEN, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNORS COMPANY ,A CORPORATION OF NEW YORK.

; ran s'rn'rnis Parana onnncn.

or mnmxun, NEAR FmKFonT-oN-rnn-mm, AND nn'rnnv TO CASSELLA COLOR var inns AND rnocnssor MAKING snmn No Drawing. I

To all whom it may concern: I

Be it known that we, Gnonc KALISGHER,

Ph. D., a subject of the King of Prussia, re-- siding at Waldstrasse 23, Mainkur, near Frankfort-on-the-Main, and Dn'rnnv NissnN, Ph. D., a subject. of the King of Prussia, residin at Habsburger Allee 63, Frankforton-theain, .Germany have invented cer-. tain new and useful Improvementsin Vat Dyes and Processes of Making Same, of

product yielding intensive violet shades is obtained by melting with the addition of p-phenylenediamin and again a dyestufi yielding claretshades results when melting with the addition of benzidin. The fact, that the character of the amin employed substantially affects the character of the re sulting dyestufi, proves that the amin forms an essential part of the molecule of the dyestuiff" The quantity'of the amin may be varied considerably. In place of aromatic polyamins, any substances may be ,used

which. like nitro or azo compounds yield polyamino compounds on reduction.

The new dyestuifs are dark powders, insoluble in water, soluble in concentrated sulfuric acid with a brown to olive color which, on the addition of paraformaldehyde, turns into a greenish blue. They yield with hydrosulfite and caustic soda lye brownish red to violet colored vats, dyeing cotton red to violet shades fast to washing, chlorin and light.- 4

The process of working is illustrated by the following example:

Example: A mixture of 15 kilos Lami- 'no.2.methylanthraquinone, 5 kilos p-phenyh enediamin and 7 5 kilos'sulfur is heated for three hours to 200-210 0., and subsequently for another four hou rs to about230 C'. After cooling down the melt is powdered Specification of Letters Patent.

tingv 1.amino.2.methylanobtained being "dition of Patented Feb. 23, 1915.

application filed June 18, m4; Serial No. 845,836.

I and any excess of sulfur is removed by treating with a hot solution of sodium sulfid. The resulting dyestufi', when dried, is a violet-brown powder, very dilficultly soluble in organic dissolving agents .of a

high boiling point; In concentrated sulfuric acid the dyestuff yields a brownisholive solution, the shade of which turns to greenish blue on the addition of paraformaldehyde.

cotton intensively violet shades. The same dyestuif is obtained, if instead ofp-phenyl- 7 With hydrosulfite' and caustic soda lye a violet vat is formed which dyesenediamin p-nitranilin or p-aminoazobenzone is heated with 1.amino.2.methylanthraquinone and sulfur. v

Dyestuffs of similar properties areobtained by using otherp'olyamins (or the corresponding nitroor azo-bodies). For instance the dyestufi' obtained with m-nitranilin dyes claret; with chlor-m-phenylenediamin (Cl:NH :NH =1:2:4) it dyes claret, with m-toluylenediamin (CH :NH,:-

NH =1:2:4) it dyes brownish-red, with 2.7.naphthylenediamin it dyes reddish violet, with- 1.5 naphthylenediamin it dyes brownish violet, with nitro-p-phenylenedliamin it dyes violet," with benzidin it dyes c aret.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we dedlare, that what we claim is: 1. Process of producing'new vat dyestuffs which consists in heating 1.amino.2.methylanthraquinone with sulfur in the presence of aromatic polyamins,

dark powders soluble in concentrated sulfuric acid with a brown to olive the dyestuffs thus color which on the addition of paraformaldehyde is changed into greenish blue, yield ing brownish-red to violet vats with hydrosulfite and caustic soda. lye, dyeing cotton red to violet shades, substantially as described.

2'. Process of producing anew vat dyestuff which consists in heatin l.an ii no.2.- methylanthraquinone with su fur 1n the presence of p-phenylenedlamm, the dyestufi thus obtainedbeing a violet-brown colored powder soluble in concentrated sulfuric acid with a brownish-ol'vecolor whng on the adparaformaldehyde is changed into greenish lue, yielding a violet vat with hydrosulfite and caustic soda ,lye, dyeing cotton intensively violet shades, substantially as described.

3. The herein described new vat dyestufis obtained by heating 1.amino.2.methylanthraquinone with sulfur in the presence of aromatic polyamins, the said dyestuffs being dark powders, soluble in concentrated sulfuric acid witha brown to olive color which on the addition of paraformaldehyde is changed into greenish blue, yielding brownish-red to violet vats with hydrosulfite and caustic soda lye which dye cotton red to violet shades, substantially as described.

4. The herein described new vat dyestufi obtained by heating 1.amino.2.methylanthraquinone with sulfur in the presence of yielding a violet vat with hydrosulfite and,

caustic soda lye which .dyes cotton intensively violet shades, substantially as I described. I

In witness whereof we have hereunto signed 'our names this 4th day of June 1914,

in the presence of two subscribing witnesses.

' DB; GEORG KALISCHER.

DR. DETLEV NISSEN.

Witnesses Q J EAN' Gnnnn, CARL GRUND. 

